drivers/input/mouse/synaptics.c

   1 /*
   2  * Synaptics TouchPad PS/2 mouse driver
   3  *
   4  *   2003 Dmitry Torokhov <dtor@mail.ru>
   5  *     Added support for pass-through port. Special thanks to Peter Berg Larsen
   6  *     for explaining various Synaptics quirks.
   7  *
   8  *   2003 Peter Osterlund <petero2@telia.com>
   9  *     Ported to 2.5 input device infrastructure.
  10  *
  11  *   Copyright (C) 2001 Stefan Gmeiner <riddlebox@freesurf.ch>
  12  *     start merging tpconfig and gpm code to a xfree-input module
  13  *     adding some changes and extensions (ex. 3rd and 4th button)
  14  *
  15  *   Copyright (c) 1997 C. Scott Ananian <cananian@alumni.priceton.edu>
  16  *   Copyright (c) 1998-2000 Bruce Kalk <kall@compass.com>
  17  *     code for the special synaptics commands (from the tpconfig-source)
  18  *
  19  * This program is free software; you can redistribute it and/or modify it
  20  * under the terms of the GNU General Public License version 2 as published by
  21  * the Free Software Foundation.
  22  *
  23  * Trademarks are the property of their respective owners.
  24  */
  25
  26 #include <linux/module.h>
  27 #include <linux/input.h>
  28 #include <linux/serio.h>
  29 #include "psmouse.h"
  30 #include "synaptics.h"
  31
  32 /*
  33  * The x/y limits are taken from the Synaptics TouchPad interfacing Guide,
  34  * section 2.3.2, which says that they should be valid regardless of the
  35  * actual size of the sensor.
  36  */
  37 #define XMIN_NOMINAL 1472
  38 #define XMAX_NOMINAL 5472
  39 #define YMIN_NOMINAL 1408
  40 #define YMAX_NOMINAL 4448
  41
  42 /*****************************************************************************
  43  *      Synaptics communications functions
  44  ****************************************************************************/
  45
  46 /*
  47  * Send a command to the synpatics touchpad by special commands
  48  */
  49 static int synaptics_send_cmd(struct psmouse *psmouse, unsigned char c, unsigned char *param)
  50 {
  51         if (psmouse_sliced_command(psmouse, c))
  52                 return -1;
  53         if (psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO))
  54                 return -1;
  55         return 0;
  56 }
  57
  58 /*
  59  * Set the synaptics touchpad mode byte by special commands
  60  */
  61 static int synaptics_mode_cmd(struct psmouse *psmouse, unsigned char mode)
  62 {
  63         unsigned char param[1];
  64
  65         if (psmouse_sliced_command(psmouse, mode))
  66                 return -1;
  67         param[0] = SYN_PS_SET_MODE2;
  68         if (psmouse_command(psmouse, param, PSMOUSE_CMD_SETRATE))
  69                 return -1;
  70         return 0;
  71 }
  72
  73 /*
  74  * Read the model-id bytes from the touchpad
  75  * see also SYN_MODEL_* macros
  76  */
  77 static int synaptics_model_id(struct psmouse *psmouse)
  78 {
  79         struct synaptics_data *priv = psmouse->private;
  80         unsigned char mi[3];
  81
  82         if (synaptics_send_cmd(psmouse, SYN_QUE_MODEL, mi))
  83                 return -1;
  84         priv->model_id = (mi[0]<<16) | (mi[1]<<8) | mi[2];
  85         return 0;
  86 }
  87
  88 /*
  89  * Read the capability-bits from the touchpad
  90  * see also the SYN_CAP_* macros
  91  */
  92 static int synaptics_capability(struct psmouse *psmouse)
  93 {
  94         struct synaptics_data *priv = psmouse->private;
  95         unsigned char cap[3];
  96
  97         if (synaptics_send_cmd(psmouse, SYN_QUE_CAPABILITIES, cap))
  98                 return -1;
  99         priv->capabilities = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 100         priv->ext_cap = 0;
 101         if (!SYN_CAP_VALID(priv->capabilities))
 102                 return -1;
 103
 104         /*
 105          * Unless capExtended is set the rest of the flags should be ignored
 106          */
 107         if (!SYN_CAP_EXTENDED(priv->capabilities))
 108                 priv->capabilities = 0;
 109
 110         if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 1) {
 111                 if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_CAPAB, cap)) {
 112                         printk(KERN_ERR "Synaptics claims to have extended capabilities,"
 113                                " but I'm not able to read them.");
 114                 } else {
 115                         priv->ext_cap = (cap[0] << 16) | (cap[1] << 8) | cap[2];
 116
 117                         /*
 118                          * if nExtBtn is greater than 8 it should be considered
 119                          * invalid and treated as 0
 120                          */
 121                         if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) > 8)
 122                                 priv->ext_cap &= 0xff0fff;
 123                 }
 124         }
 125         return 0;
 126 }
 127
 128 /*
 129  * Identify Touchpad
 130  * See also the SYN_ID_* macros
 131  */
 132 static int synaptics_identify(struct psmouse *psmouse)
 133 {
 134         struct synaptics_data *priv = psmouse->private;
 135         unsigned char id[3];
 136
 137         if (synaptics_send_cmd(psmouse, SYN_QUE_IDENTIFY, id))
 138                 return -1;
 139         priv->identity = (id[0]<<16) | (id[1]<<8) | id[2];
 140         if (SYN_ID_IS_SYNAPTICS(priv->identity))
 141                 return 0;
 142         return -1;
 143 }
 144
 145 static void print_ident(struct synaptics_data *priv)
 146 {
 147         printk(KERN_INFO "Synaptics Touchpad, model: %ld\n", SYN_ID_MODEL(priv->identity));
 148         printk(KERN_INFO " Firmware: %ld.%ld\n", SYN_ID_MAJOR(priv->identity),
 149                SYN_ID_MINOR(priv->identity));
 150         if (SYN_MODEL_ROT180(priv->model_id))
 151                 printk(KERN_INFO " 180 degree mounted touchpad\n");
 152         if (SYN_MODEL_PORTRAIT(priv->model_id))
 153                 printk(KERN_INFO " portrait touchpad\n");
 154         printk(KERN_INFO " Sensor: %ld\n", SYN_MODEL_SENSOR(priv->model_id));
 155         if (SYN_MODEL_NEWABS(priv->model_id))
 156                 printk(KERN_INFO " new absolute packet format\n");
 157         if (SYN_MODEL_PEN(priv->model_id))
 158                 printk(KERN_INFO " pen detection\n");
 159
 160         if (SYN_CAP_EXTENDED(priv->capabilities)) {
 161                 printk(KERN_INFO " Touchpad has extended capability bits\n");
 162                 if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap))
 163                         printk(KERN_INFO " -> %d multi-buttons, i.e. besides standard buttons\n",
 164                                (int)(SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap)));
 165                 if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 166                         printk(KERN_INFO " -> middle button\n");
 167                 if (SYN_CAP_FOUR_BUTTON(priv->capabilities))
 168                         printk(KERN_INFO " -> four buttons\n");
 169                 if (SYN_CAP_MULTIFINGER(priv->capabilities))
 170                         printk(KERN_INFO " -> multifinger detection\n");
 171                 if (SYN_CAP_PALMDETECT(priv->capabilities))
 172                         printk(KERN_INFO " -> palm detection\n");
 173                 if (SYN_CAP_PASS_THROUGH(priv->capabilities))
 174                         printk(KERN_INFO " -> pass-through port\n");
 175         }
 176 }
 177
 178 static int synaptics_query_hardware(struct psmouse *psmouse)
 179 {
 180         int retries = 0;
 181
 182         while ((retries++ < 3) && psmouse_reset(psmouse))
 183                 printk(KERN_ERR "synaptics reset failed\n");
 184
 185         if (synaptics_identify(psmouse))
 186                 return -1;
 187         if (synaptics_model_id(psmouse))
 188                 return -1;
 189         if (synaptics_capability(psmouse))
 190                 return -1;
 191
 192         return 0;
 193 }
 194
 195 static int synaptics_set_mode(struct psmouse *psmouse, int mode)
 196 {
 197         struct synaptics_data *priv = psmouse->private;
 198
 199         mode |= SYN_BIT_ABSOLUTE_MODE;
 200         if (psmouse_rate >= 80)
 201                 mode |= SYN_BIT_HIGH_RATE;
 202         if (SYN_ID_MAJOR(priv->identity) >= 4)
 203                 mode |= SYN_BIT_DISABLE_GESTURE;
 204         if (SYN_CAP_EXTENDED(priv->capabilities))
 205                 mode |= SYN_BIT_W_MODE;
 206         if (synaptics_mode_cmd(psmouse, mode))
 207                 return -1;
 208
 209         return 0;
 210 }
 211
 212 /*****************************************************************************
 213  *      Synaptics pass-through PS/2 port support
 214  ****************************************************************************/
 215 static int synaptics_pt_write(struct serio *port, unsigned char c)
 216 {
 217         struct psmouse *parent = port->driver;
 218         char rate_param = SYN_PS_CLIENT_CMD; /* indicates that we want pass-through port */
 219
 220         if (psmouse_sliced_command(parent, c))
 221                 return -1;
 222         if (psmouse_command(parent, &rate_param, PSMOUSE_CMD_SETRATE))
 223                 return -1;
 224         return 0;
 225 }
 226
 227 static inline int synaptics_is_pt_packet(unsigned char *buf)
 228 {
 229         return (buf[0] & 0xFC) == 0x84 && (buf[3] & 0xCC) == 0xC4;
 230 }
 231
 232 static void synaptics_pass_pt_packet(struct serio *ptport, unsigned char *packet)
 233 {
 234         struct psmouse *child = ptport->private;
 235
 236         if (child) {
 237                 if (child->state == PSMOUSE_ACTIVATED) {
 238                         serio_interrupt(ptport, packet[1], 0, NULL);
 239                         serio_interrupt(ptport, packet[4], 0, NULL);
 240                         serio_interrupt(ptport, packet[5], 0, NULL);
 241                         if (child->type >= PSMOUSE_GENPS)
 242                                 serio_interrupt(ptport, packet[2], 0, NULL);
 243                 } else if (child->state != PSMOUSE_IGNORE) {
 244                         serio_interrupt(ptport, packet[1], 0, NULL);
 245                 }
 246         }
 247 }
 248
 249 static void synaptics_pt_activate(struct psmouse *psmouse)
 250 {
 251         struct psmouse *child = psmouse->ptport->serio.private;
 252
 253         /* adjust the touchpad to child's choice of protocol */
 254         if (child && child->type >= PSMOUSE_GENPS) {
 255                 if (synaptics_set_mode(psmouse, SYN_BIT_FOUR_BYTE_CLIENT))
 256                         printk(KERN_INFO "synaptics: failed to enable 4-byte guest protocol\n");
 257         }
 258 }
 259
 260 static void synaptics_pt_create(struct psmouse *psmouse)
 261 {
 262         struct psmouse_ptport *port;
 263
 264         psmouse->ptport = port = kmalloc(sizeof(struct psmouse_ptport), GFP_KERNEL);
 265         if (!port) {
 266                 printk(KERN_ERR "synaptics: not enough memory to allocate pass-through port\n");
 267                 return;
 268         }
 269
 270         memset(port, 0, sizeof(struct psmouse_ptport));
 271
 272         port->serio.type = SERIO_PS_PSTHRU;
 273         port->serio.name = "Synaptics pass-through";
 274         port->serio.phys = "synaptics-pt/serio0";
 275         port->serio.write = synaptics_pt_write;
 276         port->serio.driver = psmouse;
 277
 278         port->activate = synaptics_pt_activate;
 279 }
 280
 281 /*****************************************************************************
 282  *      Functions to interpret the absolute mode packets
 283  ****************************************************************************/
 284
 285 static void synaptics_parse_hw_state(unsigned char buf[], struct synaptics_data *priv, struct synaptics_hw_state *hw)
 286 {
 287         memset(hw, 0, sizeof(struct synaptics_hw_state));
 288
 289         if (SYN_MODEL_NEWABS(priv->model_id)) {
 290                 hw->x = (((buf[3] & 0x10) << 8) |
 291                          ((buf[1] & 0x0f) << 8) |
 292                          buf[4]);
 293                 hw->y = (((buf[3] & 0x20) << 7) |
 294                          ((buf[1] & 0xf0) << 4) |
 295                          buf[5]);
 296
 297                 hw->z = buf[2];
 298                 hw->w = (((buf[0] & 0x30) >> 2) |
 299                          ((buf[0] & 0x04) >> 1) |
 300                          ((buf[3] & 0x04) >> 2));
 301
 302                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 303                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 304
 305                 if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 306                         hw->middle = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 307
 308                 if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 309                         hw->up   = ((buf[0] ^ buf[3]) & 0x01) ? 1 : 0;
 310                         hw->down = ((buf[0] ^ buf[3]) & 0x02) ? 1 : 0;
 311                 }
 312
 313                 if (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) &&
 314                     ((buf[0] ^ buf[3]) & 0x02)) {
 315                         switch (SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap) & ~0x01) {
 316                         default:
 317                                 /*
 318                                  * if nExtBtn is greater than 8 it should be
 319                                  * considered invalid and treated as 0
 320                                  */
 321                                 break;
 322                         case 8:
 323                                 hw->ext_buttons |= ((buf[5] & 0x08)) ? 0x80 : 0;
 324                                 hw->ext_buttons |= ((buf[4] & 0x08)) ? 0x40 : 0;
 325                         case 6:
 326                                 hw->ext_buttons |= ((buf[5] & 0x04)) ? 0x20 : 0;
 327                                 hw->ext_buttons |= ((buf[4] & 0x04)) ? 0x10 : 0;
 328                         case 4:
 329                                 hw->ext_buttons |= ((buf[5] & 0x02)) ? 0x08 : 0;
 330                                 hw->ext_buttons |= ((buf[4] & 0x02)) ? 0x04 : 0;
 331                         case 2:
 332                                 hw->ext_buttons |= ((buf[5] & 0x01)) ? 0x02 : 0;
 333                                 hw->ext_buttons |= ((buf[4] & 0x01)) ? 0x01 : 0;
 334                         }
 335                 }
 336         } else {
 337                 hw->x = (((buf[1] & 0x1f) << 8) | buf[2]);
 338                 hw->y = (((buf[4] & 0x1f) << 8) | buf[5]);
 339
 340                 hw->z = (((buf[0] & 0x30) << 2) | (buf[3] & 0x3F));
 341                 hw->w = (((buf[1] & 0x80) >> 4) | ((buf[0] & 0x04) >> 1));
 342
 343                 hw->left  = (buf[0] & 0x01) ? 1 : 0;
 344                 hw->right = (buf[0] & 0x02) ? 1 : 0;
 345         }
 346 }
 347
 348 /*
 349  *  called for each full received packet from the touchpad
 350  */
 351 static void synaptics_process_packet(struct psmouse *psmouse)
 352 {
 353         struct input_dev *dev = &psmouse->dev;
 354         struct synaptics_data *priv = psmouse->private;
 355         struct synaptics_hw_state hw;
 356         int num_fingers;
 357         int finger_width;
 358         int i;
 359
 360         synaptics_parse_hw_state(psmouse->packet, priv, &hw);
 361
 362         if (hw.z > 0) {
 363                 num_fingers = 1;
 364                 finger_width = 5;
 365                 if (SYN_CAP_EXTENDED(priv->capabilities)) {
 366                         switch (hw.w) {
 367                         case 0 ... 1:
 368                                 if (SYN_CAP_MULTIFINGER(priv->capabilities))
 369                                         num_fingers = hw.w + 2;
 370                                 break;
 371                         case 2:
 372                                 if (SYN_MODEL_PEN(priv->model_id))
 373                                         ;   /* Nothing, treat a pen as a single finger */
 374                                 break;
 375                         case 4 ... 15:
 376                                 if (SYN_CAP_PALMDETECT(priv->capabilities))
 377                                         finger_width = hw.w;
 378                                 break;
 379                         }
 380                 }
 381         } else {
 382                 num_fingers = 0;
 383                 finger_width = 0;
 384         }
 385
 386         /* Post events
 387          * BTN_TOUCH has to be first as mousedev relies on it when doing
 388          * absolute -> relative conversion
 389          */
 390         if (hw.z > 30) input_report_key(dev, BTN_TOUCH, 1);
 391         if (hw.z < 25) input_report_key(dev, BTN_TOUCH, 0);
 392
 393         if (hw.z > 0) {
 394                 input_report_abs(dev, ABS_X, hw.x);
 395                 input_report_abs(dev, ABS_Y, YMAX_NOMINAL + YMIN_NOMINAL - hw.y);
 396         }
 397         input_report_abs(dev, ABS_PRESSURE, hw.z);
 398
 399         input_report_abs(dev, ABS_TOOL_WIDTH, finger_width);
 400         input_report_key(dev, BTN_TOOL_FINGER, num_fingers == 1);
 401         input_report_key(dev, BTN_TOOL_DOUBLETAP, num_fingers == 2);
 402         input_report_key(dev, BTN_TOOL_TRIPLETAP, num_fingers == 3);
 403
 404         input_report_key(dev, BTN_LEFT, hw.left);
 405         input_report_key(dev, BTN_RIGHT, hw.right);
 406
 407         if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 408                 input_report_key(dev, BTN_MIDDLE, hw.middle);
 409
 410         if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 411                 input_report_key(dev, BTN_FORWARD, hw.up);
 412                 input_report_key(dev, BTN_BACK, hw.down);
 413         }
 414
 415         for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
 416                 input_report_key(dev, BTN_0 + i, hw.ext_buttons & (1 << i));
 417
 418         input_sync(dev);
 419 }
 420
 421 static int synaptics_validate_byte(unsigned char packet[], int idx, unsigned char pkt_type)
 422 {
 423         static unsigned char newabs_mask[]      = { 0xC8, 0x00, 0x00, 0xC8, 0x00 };
 424         static unsigned char newabs_rel_mask[]  = { 0xC0, 0x00, 0x00, 0xC0, 0x00 };
 425         static unsigned char newabs_rslt[]      = { 0x80, 0x00, 0x00, 0xC0, 0x00 };
 426         static unsigned char oldabs_mask[]      = { 0xC0, 0x60, 0x00, 0xC0, 0x60 };
 427         static unsigned char oldabs_rslt[]      = { 0xC0, 0x00, 0x00, 0x80, 0x00 };
 428
 429         if (idx < 0 || idx > 4)
 430                 return 0;
 431
 432         switch (pkt_type) {
 433                 case SYN_NEWABS:
 434                 case SYN_NEWABS_RELAXED:
 435                         return (packet[idx] & newabs_rel_mask[idx]) == newabs_rslt[idx];
 436
 437                 case SYN_NEWABS_STRICT:
 438                         return (packet[idx] & newabs_mask[idx]) == newabs_rslt[idx];
 439
 440                 case SYN_OLDABS:
 441                         return (packet[idx] & oldabs_mask[idx]) == oldabs_rslt[idx];
 442
 443                 default:
 444                         printk(KERN_ERR "synaptics: unknown packet type %d\n", pkt_type);
 445                         return 0;
 446         }
 447 }
 448
 449 static unsigned char synaptics_detect_pkt_type(struct psmouse *psmouse)
 450 {
 451         int i;
 452
 453         for (i = 0; i < 5; i++)
 454                 if (!synaptics_validate_byte(psmouse->packet, i, SYN_NEWABS_STRICT)) {
 455                         printk(KERN_INFO "synaptics: using relaxed packet validation\n");
 456                         return SYN_NEWABS_RELAXED;
 457                 }
 458
 459         return SYN_NEWABS_STRICT;
 460 }
 461
 462 static psmouse_ret_t synaptics_process_byte(struct psmouse *psmouse, struct pt_regs *regs)
 463 {
 464         struct input_dev *dev = &psmouse->dev;
 465         struct synaptics_data *priv = psmouse->private;
 466
 467         input_regs(dev, regs);
 468
 469         if (psmouse->pktcnt >= 6) { /* Full packet received */
 470                 if (unlikely(priv->pkt_type == SYN_NEWABS))
 471                         priv->pkt_type = synaptics_detect_pkt_type(psmouse);
 472
 473                 if (psmouse->ptport && psmouse->ptport->serio.dev && synaptics_is_pt_packet(psmouse->packet))
 474                         synaptics_pass_pt_packet(&psmouse->ptport->serio, psmouse->packet);
 475                 else
 476                         synaptics_process_packet(psmouse);
 477
 478                 return PSMOUSE_FULL_PACKET;
 479         }
 480
 481         return synaptics_validate_byte(psmouse->packet, psmouse->pktcnt - 1, priv->pkt_type) ?
 482                 PSMOUSE_GOOD_DATA : PSMOUSE_BAD_DATA;
 483 }
 484
 485 /*****************************************************************************
 486  *      Driver initialization/cleanup functions
 487  ****************************************************************************/
 488 static void set_input_params(struct input_dev *dev, struct synaptics_data *priv)
 489 {
 490         int i;
 491
 492         set_bit(EV_ABS, dev->evbit);
 493         input_set_abs_params(dev, ABS_X, XMIN_NOMINAL, XMAX_NOMINAL, 0, 0);
 494         input_set_abs_params(dev, ABS_Y, YMIN_NOMINAL, YMAX_NOMINAL, 0, 0);
 495         input_set_abs_params(dev, ABS_PRESSURE, 0, 255, 0, 0);
 496         set_bit(ABS_TOOL_WIDTH, dev->absbit);
 497
 498         set_bit(EV_KEY, dev->evbit);
 499         set_bit(BTN_TOUCH, dev->keybit);
 500         set_bit(BTN_TOOL_FINGER, dev->keybit);
 501         set_bit(BTN_TOOL_DOUBLETAP, dev->keybit);
 502         set_bit(BTN_TOOL_TRIPLETAP, dev->keybit);
 503
 504         set_bit(BTN_LEFT, dev->keybit);
 505         set_bit(BTN_RIGHT, dev->keybit);
 506
 507         if (SYN_CAP_MIDDLE_BUTTON(priv->capabilities))
 508                 set_bit(BTN_MIDDLE, dev->keybit);
 509
 510         if (SYN_CAP_FOUR_BUTTON(priv->capabilities)) {
 511                 set_bit(BTN_FORWARD, dev->keybit);
 512                 set_bit(BTN_BACK, dev->keybit);
 513         }
 514
 515         for (i = 0; i < SYN_CAP_MULTI_BUTTON_NO(priv->ext_cap); i++)
 516                 set_bit(BTN_0 + i, dev->keybit);
 517
 518         clear_bit(EV_REL, dev->evbit);
 519         clear_bit(REL_X, dev->relbit);
 520         clear_bit(REL_Y, dev->relbit);
 521 }
 522
 523 void synaptics_reset(struct psmouse *psmouse)
 524 {
 525         /* reset touchpad back to relative mode, gestures enabled */
 526         synaptics_mode_cmd(psmouse, 0);
 527 }
 528
 529 static void synaptics_disconnect(struct psmouse *psmouse)
 530 {
 531         synaptics_reset(psmouse);
 532         kfree(psmouse->private);
 533 }
 534
 535 static int synaptics_reconnect(struct psmouse *psmouse)
 536 {
 537         struct synaptics_data *priv = psmouse->private;
 538         struct synaptics_data old_priv = *priv;
 539
 540         if (!synaptics_detect(psmouse))
 541                 return -1;
 542
 543         if (synaptics_query_hardware(psmouse)) {
 544                 printk(KERN_ERR "Unable to query Synaptics hardware.\n");
 545                 return -1;
 546         }
 547
 548         if (old_priv.identity != priv->identity ||
 549             old_priv.model_id != priv->model_id ||
 550             old_priv.capabilities != priv->capabilities ||
 551             old_priv.ext_cap != priv->ext_cap)
 552                 return -1;
 553
 554         if (synaptics_set_mode(psmouse, 0)) {
 555                 printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
 556                 return -1;
 557         }
 558
 559         return 0;
 560 }
 561
 562 int synaptics_detect(struct psmouse *psmouse)
 563 {
 564         unsigned char param[4];
 565
 566         param[0] = 0;
 567
 568         psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
 569         psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
 570         psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
 571         psmouse_command(psmouse, param, PSMOUSE_CMD_SETRES);
 572         psmouse_command(psmouse, param, PSMOUSE_CMD_GETINFO);
 573
 574         return param[1] == 0x47;
 575 }
 576
 577 int synaptics_init(struct psmouse *psmouse)
 578 {
 579         struct synaptics_data *priv;
 580
 581         psmouse->private = priv = kmalloc(sizeof(struct synaptics_data), GFP_KERNEL);
 582         if (!priv)
 583                 return -1;
 584         memset(priv, 0, sizeof(struct synaptics_data));
 585
 586         if (synaptics_query_hardware(psmouse)) {
 587                 printk(KERN_ERR "Unable to query Synaptics hardware.\n");
 588                 goto init_fail;
 589         }
 590
 591         if (synaptics_set_mode(psmouse, 0)) {
 592                 printk(KERN_ERR "Unable to initialize Synaptics hardware.\n");
 593                 goto init_fail;
 594         }
 595
 596         priv->pkt_type = SYN_MODEL_NEWABS(priv->model_id) ? SYN_NEWABS : SYN_OLDABS;
 597
 598         if (SYN_CAP_PASS_THROUGH(priv->capabilities))
 599                 synaptics_pt_create(psmouse);
 600
 601         print_ident(priv);
 602         set_input_params(&psmouse->dev, priv);
 603
 604         psmouse->protocol_handler = synaptics_process_byte;
 605         psmouse->disconnect = synaptics_disconnect;
 606         psmouse->reconnect = synaptics_reconnect;
 607
 608         return 0;
 609
 610  init_fail:
 611         kfree(priv);
 612         return -1;
 613 }
 614
 615